function safe_add(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}

function rol(num, cnt) { return (num << cnt) | (num >>> (32 - cnt)); }
function cmn(q,a,b,x,s,t)  { return safe_add(rol(safe_add(safe_add(a,q), safe_add(x,t)),s),b); }
function ff(a,b,c,d,x,s,t) { return cmn((b&c) | ((~b)&d),a,b,x,s,t); }
function gg(a,b,c,d,x,s,t) { return cmn((b&d) | (c&(~d)),a,b,x,s,t); }
function hh(a,b,c,d,x,s,t) { return cmn(b^c^d,a,b,x,s,t); }
function ii(a,b,c,d,x,s,t) { return cmn(c^(b|(~d)),a,b,x,s,t); }

function core(x) {
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;

for(i = 0; i < x.length; i += 16) {
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;

a = ff(a,b,c,d,x[i+ 0], 7 , -680876936);
d = ff(d,a,b,c,x[i+ 1], 12, -389564586);
c = ff(c,d,a,b,x[i+ 2], 17, 606105819);
b = ff(b,c,d,a,x[i+ 3], 22, -1044525330);
a = ff(a,b,c,d,x[i+ 4], 7 , -176418897);
d = ff(d,a,b,c,x[i+ 5], 12, 1200080426);
c = ff(c,d,a,b,x[i+ 6], 17, -1473231341);
b = ff(b,c,d,a,x[i+ 7], 22, -45705983);
a = ff(a,b,c,d,x[i+ 8], 7 , 1770035416);
d = ff(d,a,b,c,x[i+ 9], 12, -1958414417);
c = ff(c,d,a,b,x[i+10], 17, -42063);
b = ff(b,c,d,a,x[i+11], 22, -1990404162);
a = ff(a,b,c,d,x[i+12], 7 , 1804603682);
d = ff(d,a,b,c,x[i+13], 12, -40341101);
c = ff(c,d,a,b,x[i+14], 17, -1502002290);
b = ff(b,c,d,a,x[i+15], 22, 1236535329);

a = gg(a,b,c,d,x[i+ 1], 5 , -165796510);
d = gg(d,a,b,c,x[i+ 6], 9 , -1069501632);
c = gg(c,d,a,b,x[i+11], 14, 643717713);
b = gg(b,c,d,a,x[i+ 0], 20, -373897302);
a = gg(a,b,c,d,x[i+ 5], 5 , -701558691);
d = gg(d,a,b,c,x[i+10], 9 , 38016083);
c = gg(c,d,a,b,x[i+15], 14, -660478335);
b = gg(b,c,d,a,x[i+ 4], 20, -405537848);
a = gg(a,b,c,d,x[i+ 9], 5 , 568446438);
d = gg(d,a,b,c,x[i+14], 9 , -1019803690);
c = gg(c,d,a,b,x[i+ 3], 14, -187363961);
b = gg(b,c,d,a,x[i+ 8], 20, 1163531501);
a = gg(a,b,c,d,x[i+13], 5 , -1444681467);
d = gg(d,a,b,c,x[i+ 2], 9 , -51403784);
c = gg(c,d,a,b,x[i+ 7], 14, 1735328473);
b = gg(b,c,d,a,x[i+12], 20, -1926607734);

a = hh(a,b,c,d,x[i+ 5], 4 , -378558);
d = hh(d,a,b,c,x[i+ 8], 11, -2022574463);
c = hh(c,d,a,b,x[i+11], 16, 1839030562);
b = hh(b,c,d,a,x[i+14], 23, -35309556);
a = hh(a,b,c,d,x[i+ 1], 4 , -1530992060);
d = hh(d,a,b,c,x[i+ 4], 11, 1272893353);
c = hh(c,d,a,b,x[i+ 7], 16, -155497632);
b = hh(b,c,d,a,x[i+10], 23, -1094730640);
a = hh(a,b,c,d,x[i+13], 4 , 681279174);
d = hh(d,a,b,c,x[i+ 0], 11, -358537222);
c = hh(c,d,a,b,x[i+ 3], 16, -722521979);
b = hh(b,c,d,a,x[i+ 6], 23, 76029189);
a = hh(a,b,c,d,x[i+ 9], 4 , -640364487);
d = hh(d,a,b,c,x[i+12], 11, -421815835);
c = hh(c,d,a,b,x[i+15], 16, 530742520);
b = hh(b,c,d,a,x[i+ 2], 23, -995338651);

a = ii(a,b,c,d,x[i+ 0], 6 , -198630844);
d = ii(d,a,b,c,x[i+ 7], 10, 1126891415);
c = ii(c,d,a,b,x[i+14], 15, -1416354905);
b = ii(b,c,d,a,x[i+ 5], 21, -57434055);
a = ii(a,b,c,d,x[i+12], 6 , 1700485571);
d = ii(d,a,b,c,x[i+ 3], 10, -1894986606);
c = ii(c,d,a,b,x[i+10], 15, -1051523);
b = ii(b,c,d,a,x[i+ 1], 21, -2054922799);
a = ii(a,b,c,d,x[i+ 8], 6 , 1873313359);
d = ii(d,a,b,c,x[i+15], 10, -30611744);
c = ii(c,d,a,b,x[i+ 6], 15, -1560198380);
b = ii(b,c,d,a,x[i+13], 21, 1309151649);
a = ii(a,b,c,d,x[i+ 4], 6 , -145523070);
d = ii(d,a,b,c,x[i+11], 10, -1120210379);
c = ii(c,d,a,b,x[i+ 2], 15, 718787259);
b = ii(b,c,d,a,x[i+ 9], 21, -343485551);

a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
}
return [a,b,c, d];
}

function binl2hex(binarray) {
var hex_tab = "0123456789abcdef";
var str = "";
for(var i=0; i<binarray.length*4; i++) {
	str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
	hex_tab.charAt((binarray[i>>2] >> ((i%4)*8)) & 0xF);
}
return str;
}

function binl2b64(binarray) {
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
for(var i=0; i<binarray.length*4; i += 3) {
	x = binarray[i>>2];
	alert(binarray[i>>5+1]);
	str += tab.charAt(((binarray[i>>5] << (i%32)) & 0x3F) | ((binarray[i>>5+1] >> (32-i%32)) & 0x3F));
}
return str;
}

function binb2b64(binarray) {
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
for(var i=0; i<binarray.length*32; i += 6) {
	alert(binarray[i>>5+1]);
	str += tab.charAt(((binarray[i>>5] << (i%32)) & 0x3F) | ((binarray[i>>5+1] >> (32-i%32)) & 0x3F));
}
// TBD: pad with =
return str;
}

function str2binl(str) {
var nblk = ((str.length + 8) >> 6) + 1; // number of 16-word blocks
var blks = new Array(nblk * 16);
for(var i=0; i < nblk * 16; i++) blks[i] = 0;
for(var i=0; i < str.length; i++) blks[i>>2] |= (str.charCodeAt(i) & 0xFF) << ((i%4) * 8);
blks[i>>2] |= 0x80 << ((i%4) * 8);
blks[nblk*16-2] = str.length * 8;
return blks;
}

function strw2binl(str) {
var nblk = ((str.length + 4) >> 5) + 1; // number of 16-word blocks
var blks = new Array(nblk * 16);
for(var i=0; i < nblk * 16; i++) blks[i] = 0;
for(var i=0; i < str.length; i++) blks[i>>1] |= str.charCodeAt(i) << ((i%2) * 16);
blks[i>>1] |= 0x80 << ((i%2) * 16);
blks[nblk*16-2] = str.length * 16;
return blks;
}